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GATE 2024 Chemical Engineering, Q65 · Mechanical Operations

The correct answer is 10 to 10.3.

Question

Consider a tray-column of diameter 120 cm. Each downcomer (there are two per tray: one inlet and one outlet) has a cross-sectional area of 575cm2.575 cm². For a tray, the percentage column cross-sectional area not available for vapour flow due to the downcomers, rounded off to 1 decimal place, is _____________

Official answer: 10 to 10.3

Why

GATE 2024 official key: 10.0 to 10.3. Column area =π(60)2≈11,309.7cm2.= π(60)² \approx 11,309.7 cm². Total downcomer area (2×575)=1150cm2.(2 \times 575) = 1150 cm². Percentage =1150/11309.7×100≈= 1150/11309.7 \times 100 \approx 10.17%.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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